The Nakamoto upgrade, activated on the Stacks network in late October 2024 around Bitcoin block 867,867, now anchors every Stacks transaction directly into the Bitcoin blockchain. This change makes reversing a confirmed Stacks transaction impossible without rewriting the Bitcoin blockchain itself, providing what the Stacks ecosystem calls 100% Bitcoin finality. The sBTC protocol, launched on mainnet in December 2024, leverages this guarantee to allow Bitcoin holders to access DeFi applications and yield products without relying on a centralized custodian. STX, the native token used for transaction fees and staking, sees its demand directly tied to network usage.
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